Copyright grants a time-limited monopoly to the reproduction of works by their authors. The idea is not that the economy benefits from protection forever, but that the authors have enough time to recoup their costs before the works become public. Many people (me included) think copyright terms are too long, but here we are discussing the idea that the term length should be zero, which I speculate most people would agree is too short. Having the economic incentive to produce good works is important to our economy, and if works can be stolen and faked immediately and the authors can’t profit from them, there is no incentive to make good things.
I guess to clarify… the quality of a reproduction hurts consumers when the quality is lower than the authentic original, like the case of the Amazon books in this article. But generally speaking, quality isn’t super high on the list of reasons for copyrights, or on the broader economic arguments. The primary reason, it is argued, that fakes and copying hurts consumers is because it’s a drain on the economic incentives for creative and productive people to author new works.